PC gaming terms and their true meanings

PCgamer:"The language of gaming is constantly mutating. For instance, "lag" used to refer to delays in client/server communication, but lately we've heard it used as if it's synonymous with "low framerate." Baffling. To help clear some things up, we've asked regular PC Gamer writer and all-round lexical savant Richard Cobbett to create a brief glossary of PC gaming's most important terms and their modern definitions."